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Sludge Stabilization

Lime sludge stabilization systems

Sodimate provides custom-designed systems with complete fromlime storage tankstosludge processingandconveying screws. The solutions are adaptable to specific site requirements for storage and loading, transport and processing needs, and conveyor size.

Post liming sludge stabilization

Dewateredsludge is mixedwith lime, preferablyquick limeinstead ofhydrated lime, in order to increase their pH to 12 though killing pathogens and micro-organism. The addition of lime increase also the sludge dry material content as lime react with water and vapor is released.

A dry material content of 30% can be easily reached whatever the type of dewatering equipment used upstream.

Sludge and lime should be mixed intimately and homogeneously to ensure that each lime molecule reacts.

Post liming sludge stabilization
Post liming sludge stabilization

Typical Sodimate configuration:

Sludge processed by adewatering system(如离心机或lt press, is collected and conveyed to asludge mixer. Powdered lime from the storage container (silo,hopper, orbig bag stand) is also fed to the mixer, generating homogenous, stabilized biosolids (Class B). TheSodimate sludge mixerdoes not alter sludge structure, contrary to the other types of mixing systems.

Advantages of a sludge stabilization system:

  • Increased dry solids content (DS%)
  • pH值规定
  • 病原体失活
  • Odor control
  • Volume reduction
  • Easier handling & storage
  • Landfill-ready

Sodimate proposes alternative storage solutions adapted to the customer’s need, depending on the product consumption and its procurement difficulties :silo,Big Bag Standorsack tip hopper.

Pre liming sludge stabilization

The pre liming sludge stabilization is usually used for 2 types of application

1°/ Sludge dewatering by filter press

A lime milk made of hydrated lime (lime milk preparation tank) or quick lime (lime slaking unit) is injected into the conditioning tank allowing increased dewatering performances.

2°/ Sludge dewatering by centrifuge

The use of quick lime which has a “delayed reactivity” allows a pre liming sludge treatment with centrifuges, whereas centrifuges are generally associated with post liming application. The delayed reactivity quick lime is discharged, dosed and injected into a maturing tank where it is mixed together with liquid sludge before being sent to the centrifuge.

The centrifuged sludge is transferred by screw conveyor and it is only once the sludge is discharged into the storage skips or the storage area that the lime starts its exothermic reaction.